Is Cinnamon Good for Fatty Liver?

Cinnamon is a popular spice with a long history of use in traditional medicine, and interest in whether cinnamon is good for fatty liver has grown alongside rising rates of the condition in the UK. Fatty liver disease affects around one in three UK adults to some degree, making effective management strategies a public health priority. This article examines what the current evidence says about cinnamon and liver health, including its potential benefits, the limitations of existing research, the risks of supplementation, and how it fits alongside evidence-based treatment recommended by NHS and NICE guidance.

What is fatty liver disease and how common is it in the UK?

Fatty liver disease affects around one in three UK adults and is most commonly MASLD, previously called NAFLD. NICE NG49 recommends lifestyle modification and a FIB-4-based assessment pathway as the cornerstone of management.

Fatty liver disease is a condition in which excess fat accumulates within liver cells. It is estimated to affect around one in three adults in the UK to some degree, according to NHS information on the condition.^[1][4] The most common form is metabolic dysfunction-associated steatotic liver disease (MASLD), which was previously known as non-alcoholic fatty liver disease (NAFLD). UK clinical guidance, including NICE guideline NG49, continues to use the term NAFLD; both terms refer to the same condition and you may encounter either in clinical settings. A separate form, alcohol-related liver disease (ALD), is caused by excessive alcohol consumption. Both conditions can progress through stages of increasing severity if left unmanaged.

MASLD is closely linked to obesity, type 2 diabetes, high blood pressure and raised cholesterol, all of which are increasingly prevalent in the UK population. Many people with early-stage fatty liver disease have no symptoms at all, meaning the condition is often identified incidentally during blood tests or imaging carried out for another reason. NHS information and NICE guidance (NG49) highlight MASLD as a significant and growing public health concern.

In its early stages, fatty liver disease is generally reversible with lifestyle changes. However, without intervention, a proportion of people progress to more serious liver damage, including fibrosis (scarring), cirrhosis, and in some cases liver failure or liver cancer. This makes early identification and management particularly important. NICE NG49 recommends lifestyle modification, including dietary change and increased physical activity, as the cornerstone of management. It also sets out a primary-care assessment pathway: a FIB-4 score (a calculation using age, liver enzyme levels and platelet count) is used to estimate fibrosis risk, with further assessment using the Enhanced Liver Fibrosis (ELF) test or FibroScan where the result is indeterminate, and referral to specialist services where risk is high. If you are concerned about your liver health, speak to your GP, who can arrange appropriate tests and advise on next steps.

Seek urgent medical attention if you develop any of the following, as these may indicate serious liver disease: yellowing of the skin or whites of the eyes (jaundice), dark urine or pale stools, swelling of the abdomen, vomiting blood or passing black tarry stools, confusion or unusual drowsiness, or severe abdominal pain.

Can cinnamon actually help with fatty liver?

Cinnamon is not a proven treatment for fatty liver disease and is not recommended by any UK clinical guideline, including NICE NG49. Its bioactive compounds have theoretical liver benefits, but evidence remains preliminary.

Cinnamon may offer some modest supportive benefits for liver health, but it is not a proven treatment for fatty liver disease and should not replace medically recommended management. Cinnamon is a spice derived from the bark of trees in the Cinnamomum family, most commonly Cinnamomum verum (Ceylon cinnamon) and Cinnamomum cassia (cassia cinnamon). It contains several bioactive compounds, most notably cinnamaldehyde and various polyphenols, which have been studied for their potential anti-inflammatory and antioxidant properties.

The theoretical basis for interest in cinnamon and liver health relates to these compounds. Chronic low-grade inflammation and oxidative stress are recognised contributors to the progression of fatty liver disease, and compounds that may reduce these processes are of scientific interest. Additionally, cinnamon has been studied for its potential to improve insulin sensitivity and reduce blood glucose levels, both of which are relevant because insulin resistance is a central driver of MASLD.

However, no UK clinical guideline, including NICE NG49 and NHS guidance on NAFLD, recommends cinnamon as a treatment for fatty liver disease. The MHRA has not licensed any cinnamon preparation as a medicine for this condition. The evidence base remains preliminary, and the studies conducted so far are generally small, short in duration, and variable in methodology. It is also worth noting that culinary use of cinnamon (small amounts used in cooking) is quite different from taking concentrated supplements, which carry additional considerations discussed below. Cinnamon used as a culinary spice in normal dietary amounts is unlikely to cause harm, but it cannot be considered a substitute for evidence-based interventions such as weight management, dietary improvement and physical activity.

What does the current research say about cinnamon and liver health?

Small trials suggest cinnamon supplementation may reduce liver enzymes and improve metabolic markers, but study quality is low and long-term effects on liver fibrosis are unknown. No UK guideline recommends cinnamon for fatty liver management.

Current research on cinnamon and liver health is promising in early-stage studies but remains insufficient to support clinical recommendations. Several small randomised controlled trials and animal studies have investigated whether cinnamon supplementation can reduce liver fat, improve liver enzyme levels (particularly alanine aminotransferase, ALT, and aspartate aminotransferase, AST), and reduce markers of inflammation.

A number of human trials, predominantly conducted in populations with NAFLD or type 2 diabetes, have reported reductions in liver enzymes and improvements in fasting blood glucose and lipid profiles following cinnamon supplementation over periods of eight to twelve weeks.^[6][7] Some studies have also reported reductions in inflammatory markers such as C-reactive protein (CRP). These findings are biologically plausible given cinnamon's known antioxidant and insulin-sensitising properties. Published systematic reviews and meta-analyses of these trials have noted that results are generally in a favourable direction for metabolic markers, but the overall quality of evidence is low.^[6][10]

However, the evidence has important limitations:

• Study size: Most trials have involved fewer than 100 participants, limiting statistical power and generalisability.

• Duration: Short follow-up periods mean long-term effects on liver fibrosis or disease progression are unknown. Importantly, most studies did not assess histological endpoints such as fibrosis stage, so it is not known whether cinnamon affects the underlying structural damage to the liver.

• Standardisation: Doses, cinnamon types (Ceylon versus cassia) and formulations vary considerably between studies, making direct comparisons difficult.

• Bias risk: Many studies have methodological limitations, including lack of blinding or inadequate control groups.

Systematic reviews and meta-analyses have noted these limitations and generally conclude that while early findings are encouraging, larger, well-designed trials are needed before cinnamon can be recommended as a therapeutic intervention. No UK clinical guideline currently includes cinnamon in the management pathway for fatty liver disease. These findings should be regarded as preliminary and do not justify using cinnamon supplements as a treatment outside of clinical advice.

Are there any risks or side effects of taking cinnamon regularly?

High-dose cassia cinnamon supplements carry a real risk of liver toxicity due to coumarin content, which is particularly concerning for people with pre-existing liver disease. Interactions with diabetes medicines and anticoagulants are also possible.

Taking cinnamon in large or supplemental doses carries real risks, even though it is safe when used as a culinary spice in everyday cooking. The most significant concern relates to coumarin, a naturally occurring compound found in high concentrations in cassia cinnamon, which is the variety most commonly sold in UK supermarkets and used in supplements. Ceylon cinnamon contains substantially lower levels of coumarin.

The European Food Safety Authority (EFSA) has established a tolerable daily intake (TDI) for coumarin of 0.1 mg per kilogram of body weight per day, based on its scientific opinion on coumarin in food. High or prolonged intake of coumarin above this threshold has been associated with liver toxicity in susceptible individuals. People with pre-existing liver conditions, including fatty liver disease, may therefore be at particular risk from high-dose cassia cinnamon supplementation, which is precisely the opposite of the intended effect.

Other potential concerns include:

• Drug interactions with blood glucose-lowering medicines: Cinnamon may have additive glucose-lowering effects when taken alongside insulin or certain oral antidiabetic drugs, potentially increasing the risk of hypoglycaemia. If you take any medicines for diabetes or blood glucose control, speak to your GP or pharmacist before taking cinnamon supplements, and do not adjust your prescribed medicines yourself.

• Anticoagulant medicines: Coumarin is structurally related to warfarin, but it is not itself an anticoagulant and the clinical evidence for a significant interaction between dietary coumarin and anticoagulation is limited. Nevertheless, if you take warfarin or any other anticoagulant, you should avoid high-dose cinnamon supplements unless agreed with your clinician, and ensure your INR is monitored as usual. The Specialist Pharmacy Service (SPS) provides UK medicines information on herbal supplement interactions for healthcare professionals.

• Allergic reactions: Some individuals may experience mouth irritation or allergic responses, particularly with cinnamon oil or high-dose supplements.

• Pregnancy and breastfeeding: High-dose cinnamon supplements should be avoided during pregnancy and breastfeeding due to limited safety data. Culinary use in normal food amounts is generally considered acceptable.

If you experience any unexpected symptoms after taking cinnamon supplements, contact your GP. Suspected adverse reactions to food supplements can be reported to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk. Always inform your GP or pharmacist if you are taking any herbal or food supplements alongside prescribed medicines.

Should you use cinnamon alongside your usual treatment plan?

Cinnamon in culinary amounts can complement a liver-friendly diet but must not replace NICE-recommended management, which centres on weight loss, dietary improvement and physical activity. Always discuss supplements with your GP before starting them.

Cinnamon used as a culinary spice can form part of a balanced, liver-friendly diet, but it should not be used as a replacement for your usual treatment plan for fatty liver disease. The evidence-based management of MASLD, as outlined by NICE NG49 and NHS guidance, centres on sustained lifestyle modification. This includes achieving and maintaining a healthy weight, following a balanced diet low in refined carbohydrates and saturated fat, and increasing physical activity.

Regarding alcohol, the UK Chief Medical Officers advise that to keep health risks from alcohol low, it is safest not to drink more than 14 units per week on a regular basis.^[12][13] For people with established fibrosis or cirrhosis, complete abstinence from alcohol is recommended, as any alcohol intake may accelerate liver damage.^[14][15] Your GP can advise on what is appropriate for your individual situation.

For those with MASLD, your GP may calculate a FIB-4 score to assess your level of fibrosis risk and, depending on the result, arrange further assessment or referral to a liver specialist in line with NICE NG49. The British Liver Trust also provides accessible patient information and support resources for people with NAFLD and MASLD.

If you are considering adding cinnamon supplements to your routine, it is important to discuss this with your GP or a registered dietitian first, particularly if you have liver disease, take prescribed medications, or have any other health conditions. Your GP can review whether supplementation is appropriate for you and monitor your liver function accordingly. Do not self-prescribe high-dose supplements based on preliminary research alone.

For those seeking support with weight management as part of their overall approach to liver health, a range of options exists, including NHS weight management services and dietitian referral. Bolt Pharmacy is a GPhC-registered UK online pharmacy offering online weight-management consultations, with prescriber review and pharmacist support, for those who may benefit from a structured approach. Any prescription treatment would only be considered where clinically appropriate following a consultation.

In summary, cinnamon is not harmful in culinary amounts and may complement a healthy diet, but it is not a treatment for fatty liver disease. Prioritise evidence-based lifestyle changes and work with your healthcare team to monitor and manage your liver health effectively.

Scientific References

1. Non-alcoholic fatty liver disease (NAFLD).
2. Metabolic dysfunction-associated steatotic liver disease (MASLD): assessment and management (NG49).
3. Metabolic dysfunction-associated steatotic liver disease (MASLD): assessment and management (NG49) [PDF].
4. Liver disease profiles, October 2022 update.
5. Prevalence of steatosis and fibrosis in young adults in the UK.
6. The effect of cinnamon supplementation on liver enzymes in adults.
7. Cinnamon may have therapeutic benefits on lipid profile, liver enzymes, insulin resistance, and high-sensitivity C-reactive protein in nonalcoholic fatty liver disease patients.
8. Effect of cinnamon (Cinnamomum Zeylanicum) supplementation on serum C-reactive protein concentrations.
9. Impact of cinnamon supplementation on cardiometabolic biomarkers of inflammation and oxidative stress.
10. Effect of cinnamon supplementation on blood pressure, oxidative stress, and inflammatory biomarkers in adults: An umbrella review of the meta-analyses of randomized controlled trials.
11. The effect of cinnamon consumption on lipid profile, oxidative stress, and inflammation biomarkers in adults: An umbrella meta-analysis of randomized controlled trials.
12. Alcohol consumption: advice on low risk drinking.
13. Drink less alcohol – Better Health.
14. Alcohol-related liver disease (ARLD).
15. Advice on physical activity, diet and alcohol | Liver disease (QS152).

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